Take a more positive attitude, and also, don't worry about needing to have such a high standard for German. You won't be able to speak like a native anyways. It's worth it, so just go for it and try your very best.

Cheers!
References :
My friend's learn German blog where he details how to learn a language: http://howtolearngermanfast.blogspot.com/

I'm not sure how you expected to learn much of the language in two weeks however. By that time I could probably just about say what my name was and where I was from.

To add to what Poet_Lleri says, he gives the polite form of come here (they still have a distinction, but it's not hard) the familiar form is simply komm hier, almost identical to English.

The problem with German is that English was once very similar to German, although more so to Dutch, Frisian, etc. After our language got successively raped by the Danes and Normans, we lost most of our declension, complex word order and case systems, and these are the hardest things in German to learn (I've not mastered them yet). But, as has been said, they follow a very regular, if not simple, pattern, so it's just practise.

Do it, I found it much more fun to learn than French IMO, and Germany's such a nice country.
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Learning German is really no harder than any other language. As with anything, 'practice makes perfect'.

As well as dong the course work it helps a great deal if you read German magazines and newspapers – e.g. Der Spiegel ('The Mirror') and Stern ('Star'). It doesn't matter if you don't understand everything, and you can always look up words you don't know in the dictionary. Also, listen to German radio programmes, watch German TV and films, and find yourself a German – speaking pen friend, or even try and practice conversation if you meet any German speakers. Nobody will blame you if you get it wrong – on the contrary, they will be flattered that you are making the effort to speak their language.

Visit Germany if you get the chance. It's a fascinating, vibrant country and the people are very hospitable.

All these things will help enormously. I speak from experience as I am fluent in German, having started learning in school and then gone on to take a degree.

So my advice is, go for it!

Viel Glück!
References :

beginning d in English is beginning t in German to drink–trinken
beginning th in English is beginning d in German to think–denken

There are some similar endings as well.

What is unusual and which does not belong to the other languages you know is the concept of combining words. That is often a source of confusion.

Usually there is an on-campus club for those who study German where they can speak it to each other. The more advanced students are a big aid.

If you are studying math, physics, philosophy, or chemistry, German is a good language to learn. (Latin if you want to read Gauss in the original). There are also some timeless operas to appreciate.
References :

Other than that, I thought the language was relatively structured.
References :

So don't give up yet!
References :
My experience in a German class!